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  本文選題：GPS　切入點：跟蹤　出處：《南京郵電大學》2013年碩士論文

【摘要】：全球定位系統(tǒng)（Global Position System，GPS）是一種全球性，全天候的實時性連續(xù)定位系統(tǒng)，具有在海陸空三維空間進行全方位實時導(dǎo)航與定位功能的新一代衛(wèi)星導(dǎo)航定位系統(tǒng)。隨著GPS更加廣泛的應(yīng)用，對GPS軟件接收機的實時性和定位精度的要求也越來越高。因此，尋找更高精度和效率的定位方法成為軟件接收機的重要任務(wù)。GPS軟件接收機由射頻前端、基帶信號處理和導(dǎo)航解算三個部分組成。跟蹤算法是基帶算法中的一部分，是實現(xiàn)導(dǎo)航定位的關(guān)鍵技術(shù)之一。 本文主要完成了基于FPGA的GPS軟件接收機跟蹤算法的設(shè)計及實現(xiàn)。首先詳細介紹了跟蹤算法的基本原理，完成了跟蹤算法中噪聲帶寬、環(huán)路增益、快捕范圍、環(huán)路濾波器等關(guān)鍵參數(shù)的設(shè)置。接著完成對GPS跟蹤系統(tǒng)中各個模塊的FPGA(Field－ProgrammableGateArray)設(shè)計。本文提出了一種基于CORDIC算法的碼環(huán)鑒相器，該鑒相算法具有精度高，結(jié)構(gòu)簡單，容易實現(xiàn)等優(yōu)點。同時，本文還對環(huán)路濾波器的參數(shù)進行了優(yōu)化，進而較大的改善了跟蹤環(huán)路的實時性。最后，在跟蹤環(huán)路的整體測試中，設(shè)計了控制模塊，協(xié)調(diào)各子模塊的工作，很好的解決了實時性問題和非整數(shù)采樣頻率下的失配問題。 本文設(shè)計的GPS跟蹤系統(tǒng)具有快速鎖定，跟蹤精度高的特點。將捕獲跟蹤系統(tǒng)下載到FPGA平臺上，，經(jīng)過實時數(shù)據(jù)流的測試，跟蹤系統(tǒng)能夠正確的實現(xiàn)對導(dǎo)航數(shù)據(jù)的解調(diào)，解調(diào)后的導(dǎo)航數(shù)據(jù)經(jīng)過導(dǎo)航解算模塊解算得到的定位精度可以達到m級，這也說明了跟蹤系統(tǒng)設(shè)計的正確性。
[Abstract]:Global Position system GPS is a global, all-weather real-time continuous positioning system. A new generation of satellite navigation and positioning system with the function of omnidirectional real-time navigation and positioning in the three-dimensional space of sea, land and air. With the wider application of GPS, the requirement of real-time and positioning accuracy of GPS software receiver is becoming higher and higher. Finding more accurate and efficient positioning methods becomes an important task of software receiver. GPS software receiver consists of three parts: RF front-end, baseband signal processing and navigation solution. Tracking algorithm is a part of base-band algorithm. It is one of the key technologies to realize navigation and positioning. This paper mainly completes the design and implementation of GPS software receiver tracking algorithm based on FPGA. Firstly, the basic principle of the tracking algorithm is introduced in detail, and the noise bandwidth, loop gain, fast capture range of the tracking algorithm are completed. The design of FPGA Field-Programmable Gate Arraybased on GPS tracking system is completed. A phase discriminator based on CORDIC algorithm is presented in this paper, which has high precision and simple structure. At the same time, the parameters of the loop filter are optimized, and the real-time performance of the tracking loop is greatly improved. Finally, the control module is designed in the overall test of the tracking loop. Coordination of the work of the sub-modules, a good solution to the real-time problem and non-integer sampling frequency mismatch problem. The GPS tracking system designed in this paper has the characteristics of fast locking and high tracking accuracy. The acquisition and tracking system is downloaded to the FPGA platform. After real-time data flow testing, the tracking system can correctly demodulate the navigation data. The positioning accuracy of the demodulated navigation data can reach m level through the navigation solution module, which also shows the correctness of the design of the tracking system.
【學位授予單位】：南京郵電大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：P228.4

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本文編號：1700376